Videoconferencing Systems with Recognition Ability

ABSTRACT

A videoconferencing system which encodes different streams of information. The information may include video, audio, speech recognized versions of the audio, and language translated versions of the audio. Text may be sent as part of the videoconference

RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No. 10/064,158 filed Jun. 14, 2002.

BACKGROUND

Videoconferencing systems allow users to communicate interactively, while seeing one another, even though they are not physically in the same place.

SUMMARY

The present application teaches advancements for videoconferencing systems. One aspect of this system recognizes voices and converts the voice as recognized to another form. Another aspect considers compensation for time delays which may occur in the system.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other aspects will now be described in detail with reference to the accompanying drawings, wherein:

FIG. 1 shows a basic embodiment of a videoconferencing system;

FIG. 2 shows a flowchart of operations including retranslation of language and time alignment;

FIG. 3 shows an exemplary screen on a videoconferencing system;

FIG. 4 shows a flowchart of operation of the exclusive access embodiment;

FIG. 5 shows a timing chart of the exclusive access system.

DETAILED DESCRIPTION

A block diagram of the videoconferencing system is shown in FIG. 1. A first user 100 is shown with a video camera 105 and an audio microphone 110. The video 106 and audio 111 are fed into respective inputs within the videoconferencing computer module 115, with the video camera being input into a video input, and the microphone being input into an audio input. The module 115 prepares the information for sending over the channel. A transmission device, e.g. a coding module, may carry out the transmission over the channel. The videoconferencing module 115 also receives communication information from the channel, from other comparable modules on the channel.

In order to conserve bandwidth, the videoconferencing computer may digitize and compress the video 106 and audio 111. The output signal is often a digital form signal 120. The digital output 120 is sent over the channel, here a network 125, to a corresponding videoconferencing computer 130 at a distant end. The videoconferencing computer 130 includes a display element 135 that displays the video and audio that have been sent over the network.

In the configuration shown in FIG. 1, the videoconferencing computer 115 may be thought of as the master, since it is sending the information to the videoconferencing computer 130. The videoconferencing computer 130 may be thought of as the slave, receiving the information from computer 115. Of course, in a usual system, the videoconferencing computer 130 will also include camera and microphone 136 to enable two-way communication. Correspondingly, the videoconferencing computer 115 will include a display 111. That means that sometimes the videoconferencing computer 115 is acting as the master with the videoconferencing computer 130 acting as the slave. At other times, the functions are reversed.

FIG. 1 also shows some additional controls 145. These controls include the exclusive access request, in which a master requests exclusive access for a time, and the “raise hand” request, in which one of the computers, when communicating as a slave, signals its desire to become the master.

According to an embodiment, the master operates according to the flowchart of FIG. 2. All of these operations may be carried out by a processor within the computer 154 and/or may be carried out for more dedicated hardware within the computer. It should also be understood that some operations specified by this flowchart may be carried out without carrying out the remaining operations.

It is conventional to compress the information being transmitted over videoconference, in order to make maximum use of the bandwidth available. At 200, both the video and sound are compressed. However, there is often more information in the video, and hence it may take longer computational wise to compress and transmit the video than the sound. In the embodiment, both the video and sound are compressed along with a timestamp indicative of their time of creation. Here, the video and sound are stored along with the timestamp TS1, indicating the time when that batch was produced. The timestamps may be produced at any desired time interval, for example every one-third second, or at the beginning of any spoken phrase.

The sound is also recognized at 205. For example, this may use a conventional speech to voice, speaker independent, voice recognition system. This produces text indicative of the spoken word. Again, this text is stored along with a timestamp indicative of the time of creation, again here TS1. The voice recognition may take even longer than the compression.

200, 205 show the timestamps (TS1) indicating the time when the video/sound/recognition was carried out. The actual time when the information is compressed is also shown, that is the video is compressed at time x1; the sound at time x2 and the voice recognition at time x3. At 210 an optional step of retranslation may be carried out. For example, a language conversion program may be used on the voice-recognized text in order to retranslate that text into a desired language at 215. This is also stored along with timestamp TS1 and is carried out at x4. At 220, all of the information, including the compressed video and sound, voice-recognized sound (which may be, for example, textual information), and translated information corresponding to the voice recognized sound, is aligned in time, so that it may be sent aligned in time. As an alternative, the information is sent as available, along with the timestamp information. The information is then time aligned at the remote end. Whether aligned at the transmitting end, or at the remote end, the time stamp information may be used to align the different parts of the message in time.

At 225, this information may be sent to the slave.

230 represents receiving an off-line access request from the slave. This is done, for example, during the time when the master has requested “exclusive access”. During the exclusive access, all the slaves are sent a message that instructs the slaves that another unit has exclusive access. The slaves, therefore, are prohibited from sending a message during this time. This prevents two different users from talking at the same time, and allows one speaker to “have the floor”. However, during the time that the one “master” has exclusive access, any of the “slaves” can send an off-line access request at 230. The off-line access request allows any of the slaves to signal a desire to speak. This may cause a “raise hand” icon to be sent to the master, so that the user at the master recognizes that someone else wants to speak.

In one embodiment, questions may be recorded and sent from slave to master. For example, packets representing the audio, video, text, and other, may be sent, representing a question. At that time, a “question pending” icon may be received and displayed, so that the master recognizes that a question is waiting. If the packet includes text indicative of the question, the text may be displayed while the master is still maintaining exclusive access. An exemplary display is shown in FIG. 3. This figure shows how a panel 300 of the display is displayed side-by-side with the actual display itself 305. This panel may include the text comments 310 that are sent and displayed at 235. The panel may also include a raise hand icon 315, a question pending icon 320, and an icon 325 indicating that the current system has exclusive access. An inactive icon shown as 330 indicates that another has exclusive access, and during this time, only certain kinds of communications can be made. In addition, any recognized or translated information can be displayed as close captioning, for example, shown as 330. This information may be transmitted as part of the transmitted video information, or can be transmitted using conventional closed captioning techniques.

FIG. 4 represents the routine which is being carried out in the “slave”. At 400, the slave receives the transmission which may include video, voice and text. The text may be both same language text or translated text, and may be as part of the digital information, or in closed captioning parts of the signal. An optional operation at 405 may convert the same language text into another language. For example, any of a number of clients may convert the information to their own desired language.

At 410, the received information is displayed. The time alignment markers may be used to maintain alignment, and/or the alignment can be taken from the way in which the information is transmitted. For example, since alignment is carried out at 220, time-aligned signals can be received and immediately displayed.

At 415, the system detects whether another unit has exclusive access. If not, the exclusive access request is enabled at 420. However, if another unit has exclusive access, then at 425, online communication is disabled, but off-line communication is enabled. The off-line communications that are enabled at 425 include the raise hand and question icons, which enable that sending/displaying the icon for either raising a hand or asking a question to the current “master”. Another operation at 435, records packets of information (video and sound or just sound). The voice is voice recognized at 435, and text only is sent. The text is displayed in FIG. 3 at 310. In this way, the exclusive-access user can see the text simultaneously with other operations. 440 shows the different action in which packets are recorded. These packets can be sent later, that is when the exclusive access ends. In both cases, the master unit is signaled that communication is pending. FIG. 3 shows the icon 335 which signals that an incoming communication is still pending.

When the master has exclusive access, it prevents two people talking at once. However, multi-unit conversation is still possible, since other units can send questions which can be displayed to the master, and can send requests as icons which can also be displayed.

However, during times of nonexclusive access, it is also possible for two people to talk at once. This is because there is often a delay between the time when one person is talking, and the time when the other unit receives that talking. For example, FIG. 5 shows how this can happen. The unit 1 is talking during the time T-1. During the time T-2, operations are carried out including alignment operations and compression operations as well as latency in the system. The information is sent during T3, and presumably received at T-4. However, during the times prior to T-1, another unit might not realize that the first unit is talking. Unit 505 is shown beginning to talk at the time T-2, which is between the end of the first unit talking and the reception. More generally, this may be happening any time between T-1 and T-4.

In this embodiment, when the user begins talking at T-1, an exclusive flag is raised shown as 510. This exclusive flag is sent to the slave at 515, and lights a light on the slave indicating that the slave should not talk. Effectively, this indicates that a communication from another unit is pending. At 505, the other unit become begins talking anyway. However, the communication sent to the unit prevents the other talking from being transmitted. At 530, the information is recorded. 525 represents the end of the sending period, that is when all the information recorded during T-1 is finished sending. At T-5, this information, recorded during the time T-2, is sent. In this way, the users are prevented from talking at the same time. Collisions are avoided, and every user gets to hear what the other user says.

Although only a few embodiments have been disclosed in detail above, other modifications are possible. For example, the text, and language converted text, can be played by a text to voice synthesizer, instead of being displayed as text. All such modifications are intended to be encompassed within the following claims. 

1. A method, comprising: obtaining a video sequence including both a video part and a sound part associated with said video part; first compressing said video part using a first process to create a compressed video part; second compressing the sound part using a second process to create a compressed sound part; associating a first time stamp with said compressed video part, said first time stamp being indicative of a time associated with said video part; associating a second time stamp with said compressed sound part, said second time stamp indicating a time associated with said sound part; storing the compressed video part associated with said first time stamp; and storing the compressed audio part associated with said second time stamp.
 2. A method as in claim 1 wherein said first time stamp and said second time stamp each represent an indication that has been created at one of a plurality of specified intervals of time.
 3. A method as in claim 1, wherein said time stamps are created each time that a specified phrase within the audio information is created.
 4. A method as in claim 1, further comprising producing text associated with said video and audio, and storing said text along with another time stamp that synchronizes the text with said video and audio information.
 5. A method as in claim 4, wherein said creating text comprises recognizing spoken words within said audio information.
 6. A method as in claim 4, wherein said text is in a plurality of different languages, each representing the same information in a different language, including at least a first text in a first language having said first timestamp representing said first time, and a second text in a second language, representing the same information as the first text in said first language, and also having a time stamp representing the first time.
 7. A method as in claim 1, wherein said first compressing and said second compressing take different amounts of time, and said information is stored at aligned times.
 8. A method as in claim 1, wherein said first compressing and said second compressing take different amounts of time, wherein said information is stored at non aligned times.
 9. An apparatus, comprising: a video receiver, obtaining video information, and producing a video output indicative thereof; a sound receiver obtaining a sound part associated with said video information; a signal compressor, first compressing said video part to create a compressed video part, and second compressing the sound part to create a compressed sound part; a storage part storing the compressed video part and storing the compressed audio part including time alignment information.
 10. An apparatus as in claim 9, further comprising a time stamp association device, associating a first time stamp with said compressed video part, said first time stamp being indicative of a time associated with said video information, associating a second time stamp with said compressed sound part, said second time stamp indicating a time associated with said sound part; wherein said storage part stores the compressed video part associated with said first time stamp and storing the compressed audio part associated with said second time stamp.
 11. An apparatus as in claim 9, wherein said time alignment information includes an order in which said parts are stored.
 12. An apparatus as in claim 9, further comprising a transmission part, which transmits the compressed video part and said compressed audio part and said time alignment information.
 13. An apparatus as in claim 10 wherein said time stamp association device creates said time stamps at each of a plurality of specified intervals of time.
 14. An apparatus as in claim 10, wherein said wherein said time stamp association device creates said time stamps each time that a specified phrase within the audio information begins.
 15. An apparatus as in claim 9, further comprising a text producing part, and said time alignment information includes time alignment information between said text and at least one of said video and audio information.
 16. An apparatus as in claim 15, wherein said text producing part recognizes spoken words within said audio information.
 17. An apparatus as in claim 15, wherein said text is in a plurality of different languages, each representing the same information in a different language, including at least a first text in a first language having said first timestamp representing said first time, and a second text in a second language, representing the same information as the first text in said first language, and also having a time stamp representing the first time.
 18. An apparatus as in claim 9, wherein said signal compressor takes different amounts of time to compress video than it does to compress audio, and said information is stored at aligned times.
 19. An apparatus as in claim 9, wherein said signal compressor takes different amounts of time to compress video than it does to compress audio, wherein said information is stored at non aligned times.
 20. An apparatus, comprising: a video receiver, obtaining video information, and producing a video output indicative thereof; a sound receiver obtaining a sound part associated with said video information; a text creating part, which creates text; a signal compressor, first compressing said video part to create a compressed video part, and second compressing the sound part to create a compressed sound part; a time alignment device, producing time alignment information that time aligns said video information, said sound part, and said text.
 21. An apparatus as in claim 20, wherein said time alignment device includes a time stamp association device, associating a first time stamp with said compressed video part, said first time stamp being indicative of a time associated with said video information, associating a second time stamp with said compressed sound part, said second time stamp indicating a time associated with said sound part and associating a third time stamp with a time of creation of creating said text.
 22. An apparatus as in claim 20, further comprising a storage part storing the compressed video part associated with said time alignment information.
 23. An apparatus as in claim 20, wherein said time alignment device includes a part that adjusts a time of storing said compressed video, a time of storing said sound part, and a time of storing said text.
 24. An apparatus as in claim 20, further comprising a transmission part, which transmits the compressed video part and said compressed audio part and said time alignment information.
 25. An apparatus as in claim 20, wherein said text producing part recognizes spoken words within said audio information.
 26. An apparatus as in claim 20, wherein said text is in a plurality of different languages, each representing the same information in a different language, including at least a first text in a first language having said first timestamp representing said first time, and a second text in a second language, representing the same information as the first text in said first language, and also having a time stamp representing the first time. 